Testing the equivalence principle via the shadow of black holes

Abstract

We study the equivalence principle, regarded as the cornerstone of general relativity, by analyzing the deformation observable of black hole shadows. Such deformation can arise from new physics and may be expressed as a phenomenological violation of the equivalence principle. Specifically, we assume that there is an additional background vector field that couples to the photons around the supermassive black hole. This type of coupling yields impact on the way the system depends on initial conditions, and affects the black hole shadow at different wavelengths by a different amount, and therefore observations of the shadow in different wavelengths could constrain such couplings. This can be tested by future multi-band observations. Adopting a specific form of the vector field, we obtain constraints on model parameters from Event Horizon Telescope observations and measurements of gas/stellar orbits.

10 pages, 3 figures

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Cited by in corpus (38)

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• Black holes with scalar hair in light of the Event Horizon Telescope
• Testing $F(Q)$ gravity with redshift space distortions
• Influence of quintessence dark energy on the shadow of black hole
• Towards precision measurements of accreting black holes using X-ray reflection spectroscopy
• Photon Ring and Observational Appearance of a Hairy Black Hole
• Superradiance evolution of black hole shadows revisited
• Tests of Loop Quantum Gravity from the Event Horizon Telescope Results of Sgr A${}^{\ast }$
• Deflection Angle and Shadow Behaviors of Quintessential Black Holes in arbitrary Dimensions
• No-Hair Theorem in the Wake of Event Horizon Telescope
• The shadows and observational appearance of a noncommutative black hole surrounded by various profiles of accretions
• Interpreting cosmological tensions from the effective field theory of torsional gravity
• Einstein-Æther Gravity in the light of Event Horizon Telescope Observations of M87*
• Testing Generalized Einstein-Cartan-Kibble-Sciama Gravity using Weak Deflection Angle and Shadow Cast
• Shadows of 5D Black Holes from String Theory
• Superradiant evolution of the shadow and photon ring of Sgr A${}^{\star }$
• Probing the Lorentz Symmetry Violation Using the First Image of Sagittarius A*: Constraints on Standard-Model Extension Coefficients
• Constraints on Barrow entropy from M87* and S2 star observations
• Chaotic Solutions and Black Hole Shadow in $f(R)$ gravity
• Quasinormal modes of black holes in f(T) gravity
• Image of a regular phantom compact object and its luminosity under spherical accretions
• Rotating black holes without ${\mathbb{Z}}_2$ symmetry and their shadow images
• Deflection angle and lensing signature of covariant f(T) gravity
• New test on general relativity and $f(T)$ torsional gravity from galaxy-galaxy weak lensing surveys
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Testing general relativity with the stellar-mass black hole in LMC X-1 using the continuum-fitting method
• Testing the violation of the equivalence principle in the electromagnetic sector and its consequences in $f(T)$ gravity
• The shadow of regular black holes with asymptotically Minkowski core
• Shadow of black hole surrounded by magnetized plasma: Axion-plasmon cloud
• Testing Born-Infeld $f(T)$ teleparallel gravity through Sgr A${}^{\star }$ observations
• Constraining ultralight bosonic dark matter with Keck observations of S2's orbit and kinematics
• Quasinormal Modes in Noncommutative Schwarzschild black holes
• Gaussian-process reconstructions and model building of quintom dark energy from latest cosmological observations
• New test on the Einstein equivalence principle through the photon ring of black holes
• Light from Schwarzschild Black Holes in de Sitter expanding universe
• Theory and phenomenology of a four dimensional string-corrected black hole
• Testing the Weak Equivalence Principle near black holes
• Reconstructing $f(T)$ modified gravity from ECHDE and ECNADE models